Linear solenoid device

Details Linear solenoid device Linear solenoid device

1980-06-09

1981-12-15

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

335229, 335234, H01F 708

Patent

active

043062067

ABSTRACT:
A linear solenoid device includes a stator defining a cylindrical stator opening, and a pair of axially spaced cylindrical stator pole surfaces. An armature is mounted within the stator opening for movement parallel to the stator pole surfaces. The armature defines a pair of armature pole surfaces which overlap the stator pole surfaces by varying areas as the armature is moved. Annular air gaps are defined between the stator pole surfaces and the armature and the armature has mounted thereon a pair of cylindrical radially polarized permanent magnets, each such magnet being adjacent one of the armature pole surfaces. When a stator coil is energized, movement of the armature results from the varying reluctance across the air gaps as the armature pole surfaces overlap varying areas of the stator pole surfaces and, also, from repulsion of the permanent magnets. As a consequence, higher force outputs are attainable.

REFERENCES:
patent: 3504315 (1970-03-01), Stanwell
patent: 3728654 (1973-04-01), Tada
patent: 3783423 (1974-01-01), Mater et al.
patent: 4157520 (1979-06-01), Moates et al.

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